Riyadh — Mubasher: The Saudi Exchange (Tadawul) announced an update to the market order execution mechanism for the Main Market and Nomu – Parallel Market to be effective as of Sunday, 4 October 2026.
The new mechanism allows market orders to be executed against available quantities across multiple price levels within a maximum range of five price ticks from the best available price, according to an official statement.
Under the updated rules, any remaining unexecuted portion of an order that reaches the five-tick limit, or encounters a lack of liquidity within that range, will be converted into a limit order at the last executed price.
The update replaces the previous system where market orders were executed only at the best available price, with any remainder converted to a limit order at that specific execution price.
Tadawul stated that the update aims to increase the volume of market orders executed immediately by accessing additional liquidity across broader price increments.
The change applies exclusively to securities listed on the Main Market and Nomu – Parallel Market, while the derivatives market mechanism remains unchanged.
Furthermore, this technical adjustment is designed to improve execution efficiency and market depth for participants in the Saudi equity markets.
